Chapter 8 Notes
Chapter 8 Notes HCMG 3701
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This 2 page Class Notes was uploaded by Bahja Benford on Sunday March 27, 2016. The Class Notes belongs to HCMG 3701 at Clayton State University taught by Michael E. Dalmat in Summer 2015. Since its upload, it has received 19 views. For similar materials see Intro to Epidemiology in Nursing and Health Sciences at Clayton State University.
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Date Created: 03/27/16
Epidemiology Chapter 8: Infectious Diseases, Investigations, and Outbreaks IDs: Important cause of morbidity/mortality in the US and worldwide. th - 8 leading cause: pneumonia and influenza (2005) Epidemiologic Triangle: Agent, Host, Environment (infections and chronic diseases) Agent= Pathogens Environmental Host= Person or Animal Biological Air Chemical Water Nutritional Temperature Physical Food and Surface (door knobs, tables, etc) Warm water is a cause for concern. Host Characteristics 1. Immunity: - Active: has developed from disease; longer duration - From vaccine or may already have the disease - Passive: mother-child during breastfeeding; 3-6 months - Animal, antibodies, short-lived Herd Immunity: What is it? Protection from the disease within a large group of people. Achieved through vaccines. Threshold: 70% # needed to be vaccinated in order for people to be protected. 2. Incubation Period: Time when infected inoculated until the time they show first symptoms. 3. Sub-clinical illnesses: Hep B, C; HIV/AIDS. Doormant symptoms or asympt. 4. Generation Time: time you get infect. To max infectiousness of disease. 5. Carrier Status: may be potential source of infection. May not have signs/symptoms. Agents Bacteria: antibiotics Virus: no cure, vaccination to lessen occurrence of symptoms Parasites Fungus Modes of Transmission Direct: person to person: host to host Indirect: vehicle borne; unsanitary food; fomites; unclean water - Airborne (droplet), vector (insects or rats) - TB! Environmental (reservoir: human, animal, soil, plants, etc.) Climate: Water, moist Physical Biologic: Bacteria Social: urban rd Economic: 3 world countries Chain of Infection 1. Pathogen 2. Portal of exit 3. Method of transmission 4. Portal of exit 5. Susceptible host Airborne Diseases: Legionnaire’s Disease, Influenza, Pneumonia.
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